PIC18F24J11 MICROCHIP [Microchip Technology], PIC18F24J11 Datasheet - Page 364

• Manufacturer Part Number: PIC18F24J11
• Description: 28/44-Pin, Low-Power, High-Performance USB Microcontrollers with nanoWatt XLP Technology
• Manufacturer: MICROCHIP [Microchip Technology]

PIC18F46J11 FAMILY
22.2
A single comparator is shown in
the relationship between the analog input levels and
the digital output. When the analog input at V
than the analog input, V
tor is a digital low level. When the analog input at V
is greater than the analog input, V
comparator is a digital high level. The shaded areas of
the output of the comparator in
the uncertainty due to input offsets and response time.
FIGURE 22-2:
FIGURE 22-3:
DS39932D-page 364
V
V
Output
IN
IN
-
+
V
V
IN
IN
Comparator Operation
+
-
VA
R
S
Legend:
+
–
< 10k
SINGLE COMPARATOR
COMPARATOR ANALOG INPUT MODEL
IN
-, the output of the compara-
A
IN
Figure
C
V
I
R
R
VA
Figure 22-2
LEAKAGE
C
5 pF
PIN
T
IC
S
IN
PIN
-, the output of the
22-2, along with
Output
= Input Capacitance
= Threshold Voltage
= Leakage Current at the pin due to various junctions
= Interconnect Resistance
= Source Impedance
= Analog Voltage
IN
represent
+ is less
IN
V
+
DD
V
V
T
T
= 0.6V
= 0.6V
22.3
Response time is the minimum time, after selecting a
new reference voltage or input source, before the
comparator output has a valid level. The response time
of the comparator differs from the settling time of the
voltage reference. Therefore, both of these times must
be considered when determining the total response to
a comparator input change. Otherwise, the maximum
delay of the comparators should be used (see
Section 29.0 “Electrical
22.4
Figure 22-3
input. Since the analog pins are connected to a digital
output, they have reverse biased diodes to V
V
and V
by more than 0.6V in either direction, one of the diodes
is forward biased and a latch-up condition may occur.
A maximum source impedance of 10 k is
recommended for the analog sources. Any external
component connected to an analog input pin, such as
a capacitor or a Zener diode, should have very little
leakage current.
SS
. The analog input, therefore, must be between V
DD
. If the input voltage deviates from this range
Comparator
Analog Input Connection
Considerations
I
±100 nA
V
LEAKAGE
SS
provides a simplified circuit for an analog
R
IC
 2011 Microchip Technology Inc.
Response Time
Characteristics”).
Comparator
Input
DD
and
SS